3htc
From Proteopedia
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| , resolution 2.3Å | |||||||
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| Activity: | Thrombin, with EC number 3.4.21.5 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
THE STRUCTURE OF A COMPLEX OF RECOMBINANT HIRUDIN AND HUMAN ALPHA-THROMBIN
Contents |
Overview
The crystallographic structure of a recombinant hirudin-thrombin complex has been solved at 2.3 angstrom (A) resolution. Hirudin consists of an NH2-terminal globular domain and a long (39 A) COOH-terminal extended domain. Residues Ile1 to Tyr3 of hirudin form a parallel beta-strand with Ser214 to Glu217 of thrombin with the nitrogen atom of Ile1 making a hydrogen bond with Ser195 O gamma atom of the catalytic site, but the specificity pocket of thrombin is not involved in the interaction. The COOH-terminal segment makes numerous electrostatic interactions with an anion-binding exosite of thrombin, whereas the last five residues are in a helical loop that forms many hydrophobic contacts. In all, 27 of the 65 residues of hirudin have contacts less than 4.0 A with thrombin (10 ion pairs and 23 hydrogen bonds). Such abundant interactions may account for the high affinity and specificity of hirudin.
Disease
Known diseases associated with this structure: Dysprothrombinemia OMIM:[176930], Hyperprothrombinemia OMIM:[176930], Hypoprothrombinemia OMIM:[176930]
About this Structure
3HTC is a Protein complex structure of sequences from Hirudinaria manillensis and Homo sapiens. Full crystallographic information is available from OCA.
Reference
The structure of a complex of recombinant hirudin and human alpha-thrombin., Rydel TJ, Ravichandran KG, Tulinsky A, Bode W, Huber R, Roitsch C, Fenton JW 2nd, Science. 1990 Jul 20;249(4966):277-80. PMID:2374926
Page seeded by OCA on Thu Mar 20 19:05:21 2008
